[Lowfer] Antenna Design (off topic)

Wed, 1 May 2002 22:40:42 -0000

HI Les,

If you can tell me more about what you are starting with, I can design a
proper yagi
for this frequency.  I will need to know if maximum gain or directional
discrimination
is your objective. For example if you have a  station that will QRM you at
90 degrees
off heading, a yagi with a null at 90 degrees can be developed. There is a
very good chance
that the elements are way too widely spaced and will have to be moved.
Either more elements
can be added or the boom may be shortened. If you desire a direct 50 ohm
feed, then I
can design something with that in mind too, but often at a slight overall
performance reduction.
I need to know boomlength, boom diameter, element diameter, element to boom
details.

73, Jim Shaffer, WB9UWA.

----- Original Message -----
From: Les Rayburn <[email protected]>
To: <[email protected]>
Sent: Wednesday, May 01, 2002 5:13 PM
Subject: [Lowfer] Antenna Design (off topic)

>
>
> Sorry to post an off topic message to the group, but I know that
> many folks are active in antenna design software. I plan to put
> the new XM medfer beacon on the air later this summer,
> and will run AM voice mode during Spring and Summer with
> QRSS mode during DX season.
>
> My plan for the AM mode is to run NOAA Weather Radio 24/7
> as an aid to those local residents who don't have an alert radio.
>
> I'd like to cut down a Radio Shack five element FM Yagi
> to work at 162.5mhz. The beam will be mounted vertically,
> and will be used for a distant station reception (the Birmingham
> station has frequent outages).
>
> Is there someone who's handy with the software that can tell me
> what length to cut the elements?
>
> 73,
>
>
>
> Les Rayburn, director
> High Noon Films
> 100 Centerview Drive
> Suite 111
> Birmingham, AL 35216
> (205) 824-8930
> (205) 824-8960 FAX
> (205) 253-4867 CELL
>
>
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